<!--
 * @Author: your name
 * @Date: 2021-03-15 19:19:28
 * @LastEditTime: 2021-03-16 01:41:08
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \xu\shop_manager\shop_vue\src\components\goods\Params.vue
-->
<template>
   <div>
     <!-- 面包屑导航区域 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>参数列表</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图区 -->
     <el-card>
       <el-alert title="注意:只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
       <el-row class="cat_opt">
         <el-col>
           <span>选择商品分类：</span>
           <!-- 选择商品分类的级联选择框 -->
           <el-cascader :options="catelist" :props="{ expandTrigger: 'hover', cateProps }" v-model="selectedCateKeys" @change="handleChange"></el-cascader>
         </el-col>
       </el-row>
       <!-- tab页签区域 -->
       <el-tabs v-model="activeName" @tab-click="handleTabClick">
         <!-- 添加动态参数的面板 -->
         <el-tab-pane label="动态参数" name="many">
           <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
           <!-- 动态参数列表 -->
           <el-table :data="manyTabData" border stripe>
             <!-- 索引列 -->
             <el-table-column type="expand">
               <template v-slot="scope">
                 <!-- 循环渲染tag标签 -->
                 <el-tag v-for="(item, i) in  scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                 <!-- 输入文本框 -->
                 <el-input v-if="scope.row.inputVisible" v-model="scope.row.inputValue" size="small" 
                 @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" 
                 ref="saveTagInput" class="input-new-tag">
                 </el-input>
                 <!-- 添加的按钮 -->
                 <el-button v-else size="small" @click="showInput(scope.row)">+ new tag</el-button>
               </template>
             </el-table-column>
             <el-table-column type="index"></el-table-column>
             <el-table-column label="参数名称" prop="attr_name"></el-table-column>
             <el-table-column label="操作">
               <template v-slot="scope">
                 <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                 <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParmas(scope.row.sttr_id)">删除</el-button>
               </template>
             </el-table-column>
           </el-table>
         </el-tab-pane>
         <!-- 添加静态属性的面板 -->
         <el-tab-pane label="静态属性" name="only">
           <el-button type="primary" sizse="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
           <!-- 动他参数列表 -->
           <el-table :data="onlyTabData" border stripe>
             <!-- 索引列 -->
             <el-table-column type="expand">
               <template v-slot="scope">
                 <!-- 循环渲染tag标签 -->
                 <el-tag v-for="(item, i) in  scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                 <!-- 输入文本框 -->
                 <el-input v-if="scope.row.inputVisible" v-model="scope.row.inputValue" size="small" 
                 @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)" 
                 ref="saveTagInput" class="input-new-tag">
                 </el-input>
                 <!-- 添加的按钮 -->
                 <el-button v-else size="small" @click="showInput(scope.row)">+ new tag</el-button>
               </template>
             </el-table-column>
             <el-table-column type="index"></el-table-column>
             <el-table-column label="属性名称" prop="attr_name"></el-table-column>
             <el-table-column label="操作">
               <template v-slot="scope">
                 <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                 <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParmas(scope.row.sttr_id)">删除</el-button>
               </template>
             </el-table-column>
           </el-table>
         </el-tab-pane>
       </el-tabs>
     </el-card>
     <!-- 添加参数的对话框 -->
     <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
       <!-- 添加参数的表单 -->
       <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
         <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="addFormRef.attr_name"></el-input>
         </el-form-item>
       </el-form>
       <span slot="footer" class="dialog-footer">
         <el-button @click="addDialogVisible = false">取消</el-button>
         <el-button type="primary" @click="addParams">确定</el-button>
       </span>
     </el-dialog>
     <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
       <el-form :model="editForm" :rules="addFormRules" ref="editFormRef">
         <el-form-item :label="titleText" prop="attr_name">
           <el-input v-model="editForm.attr_name"></el-input>
         </el-form-item>
       </el-form>
       <span slot="footer" class="dialog-footer">
         <el-button @click="editDialogVisible = false">取消</el-button>
         <el-button type="primary" @click="editParams">确定</el-button>
       </span>
     </el-dialog>
   </div>
</template>

<script>
export default {
   data () {
      return {
        catelist: [],
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        // 级联选择框的数组
        selectedCateKeys: [],
        // 被激活的页签的名称
        activeName: 'many',
        // 动态参数数据
        manyTabData: [],
        // 静态属性的数据
        onlyTabData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {},
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name: [
            {required: true, message: '请输入参数名称', trigger: 'blur'}
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        editForm: {},
        // // 控制按钮与文本框的显示与隐藏
        // inputVisible: false,
        // //文本框中输入的内容
        // inputValue: ''
      };
   },
   created() {
     this.getCateList()
   },

   components: {},
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回true
    isBtnDisabled () {
      if(this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId() {
      if(this.selectedCateKeys === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    titleText() {
      if(this.activeName === "many") {
        return '动态参数'
      }
      return '静态属性'
    }
  },
   methods: {
    //  获取所有的商品的分类
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if(res.meta.status !== 200 ) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
    },
    // 级联选择框中项变化，会触发这个函数
    handleChange() {
      
      // 证明选中的是三级分类
      this.getParamsData()
      
    },
    // tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数列数
    async getParamsData() {
      // 证明选中的不是三级分类
      if(this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTabData = []
        this.onlyTabData = []
        return
      }
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
       const { data: res } = await this.$http.get(`categories/${this.cateId}/attribute`,
      {
        params: { sel: this.activeName }
      })
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => { 
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      });
      if(this.activeName === 'many') {
        this.manyTabData = res.data
      }else{
        this.onlyTabData = res.data
      }
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const { data: res} = await this.$http.post(`categories/${this.cateId}/attributes`,
        {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const { data: res} = await this.$http.get(`categories/${this.cateId}/atrributes/${attr_id}`,
      {
        params: { attr_sel: this.activeName}
      })
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm =  res.data
      this.$message.success('获取参数信息成功')
      this.editDialogVisible = false
    },
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return
        const {data: res} = this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
        {
          params: {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,

          }
        })
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败')
        }
        this.$message.success('修改参数信息成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件，是否继续？', '提示',{
      confirmButtonText: '确定',
      cancelButtonText: '取消',
      type: 'warning'
      }).catch(err => err)
      if(confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateID}/attributes/${attr_id}`)
      if(res.meta.status !== 200){
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点，或按下enter键会触发
    handleInputConfirm(row) {
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 没有return ，则证明输入了内容，需要做处理
      //前端页面push了，但是后台还没有
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    // 点击按钮，展示文本框切换
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick方法的作用是，当页面上元素被重新渲染之后，才能执行回调函数中的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
   }
}
</script>
<style lang='less' scoped>
  .cat_opt {
    margin: 15px 0;
  }
  .el-tag{
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>
